Compressor.



No. 792,788. PATENTED JUNE 20, 1905.

W. PRELLWITZ.

GOMPRESSOR.

APPLIOATION FILED APR. 26.1904.

2 SHEETS-SHEET .1.

fiiineaveova) W. J w/62d? c? a .i I 44m PATENTED JUNE 20, 1905.

W. PRELLWITZ.

COMPRESSOR. APPLICATION FILED APR. 25, 1904.

2 SHEETS-$111231 2.

UNITED STATES Patented June 20, 1905.

PATENT OFFICE.

IVILLIAIWI PRELLWITZyOF EASTON, PENNSYLVANIA, ASSIGNOR TO THE INGERSOLL-SERGEANT DRILL COMPANY, OF NEIV YORK, N. Y., A CORPORATION OF WEST VIRGINIA.

COMPRESSOR.

SPECIFICATIQN forming part of Letters Patent No. 792,788, dated June 20, 1905. Application filed Apri 25, 1904. Serial No. 204,744.

To all rah/c717, it may concern:

Be it known that I, WILLIAM PRELLWITZ, a citizen of the United States, and a resident of Easton, in the county of Northampton and State of Pennsylvania, have invented a new and useful Improvement in Compressors, of which the following is a specification.

This invention consists in an improvement in compressors such as are commonly known as air-compressors, but which are also applicable for the compression of other gaseous or aeriform bodies.

The invention particularly relates to improvements in the cylinder and its discharge valve or valves, and has for its objects to provide certain advantageous features in the construction, form, and assembly of the several parts whereby there is obtained an increased port area, a freer escape for the fluid by the valve, a smaller movement of the valve, and a lighter, less noisy, and more durable valve.

A practical embodiment of my invention is represented in the accompanying drawings, in which Figure 1 is a vertical longitudinal section through the cylinder of a double-acting aircompressor and its piston, the piston-rod and air-inlet tube being shown in full lines, the discharge-valve at one end of the cylinderchamber being shown closed, and the valve at the other end of the chamber being shown open. Fig. 2 is an enlarged detail outside view of a portion of the valve, the plate which guides the valve and limits its movement, and one of the springs which tend to hold the valve closed. Fig. 3 is a transverse section taken in the plane of the line A A of Fig. 2

- looking in the direction of the arrows, a portion of the cylinder-head and its annular port being also shown, the valve being shown in full lines open and in dotted lines closed; and Fig. 4 is a similar View taken in the plane of the line B B of Fig. 2 looking in the direction of the arrows.

The cylinder is denoted as a whole by 1, its inner heads, which close the piston-chamber, by 2, and the outer heads by 3. The piston is denoted by 4, its rod by 5, and its fluid-inlet tube by 6.

The piston is shown herein as being provided with annular passages 7 in its opposite faces and annular valves 8 for controlling the passage of the fluid from within the piston to the piston-chamber upon one side or the other of the piston, depending upon the direction in which the piston is moving. Each cylinder-head is provided with an annular passage 9 in proximity to the inner wall of the piston-chamber. The outer face of the head 2 is provided with an annular seat 10 exterior to the passage 9 and an annular seat 11 interior to the passage 9. The annular valve comprises a ring portion 12, having an outer valve-face 13 and an inner valve-face 14, fitted to engage the seats 10 and 11, respectively This valve is further provided with an annular flange 15, which flange in the present instance projects from the ring portion of the valve about midway between its inner and outer walls. The means which I have shown for guiding the valve in its movements and also for limiting the outer movement of the valve are constructed and arranged as follows: A plate 16 is secured to the outer face of the head 2, but spaced therefrom by lugs 17. The means which I have shown for securing the plate 16 in position are the bolts 18, which also serve to hold the cylinder-head 2 in position at the end of the piston-chamber. This plate 16 is herein shown as of ring form, its inner wall 19 engaging the outer or peripheral wall of the flange 15 of the valve, the outer part of the ring portion 12 of the valve overlapping the inner face of the plate. It will thus be'seen that the plate 16 not only guides the valve in its movements toward and away from its seats, but also limits the outward movement of the valve. This plate 16 is provided with an annular series of holes 20 for permitting the free escape of the fluid by the outer wall of the valve if the spaces 21 between the succeeding lugs 17 are not of sufficient area.

The valve is held normally closed by means of a spring 22, the free end of which engages the outer face of the ring portion of the valve exterior to the flange 15. The inner face of the plate 16 is cut away opposite the free end of the spring 22, so as to permit the spring to be forced back into the plane of the plate when the valve is opened. These springs 22 may be also secured in position by the bolts 18, the said springs being provided with laterally-turned portions 23, through which the bolts pass. This also permits the springs to extend inwardly between the plate 16 and the cylinder-head in the spaces 21', formed by the lugs 17.

It is evident that the flange 15 of the valve may be located at different positions on the outer face of the ring portion of the valve to suit different requirements.

It will be seen that by the construction herein set forth the annular passage may be located very close to the wall of the piston-chamber, thus giving the passage a large area without making it abnormally wide. By permitting the fluid to escape both inside and outside the ring portion of the valve it enables the valve to have a small movement and yet provide the necessary area for the free discharge of the fluid. Furthermore, the valve may be made very light, thus materially reducing the noise due to the movement thereof.

What I claim as my invention is 1. A cylinder-head having an annular passage therethrough, an annular valve therefor comprising a ring portion and a flange, and an annular plate secured to the head and spaced therefrom, the inner wall of the plate engaging the outer wall of the flange, forming a guide for the valve and'limiting its outward movement.

2. A cylinder-head having an annular passage therethrough, an annular valve therefor comprising'a ring portion and a flange, an annular plate secured to the head and spaced therefrom, its inner wall formingaguide for the valve and limitingits outward movement, and holes through the plate for permitting the passage of the fluid by the outside wall of the valve.

3. A cylinder-head having an annular passagetherethrough, an annular valve therefor, a plate secured to the cylinder-head and spaced therefrom, its inner wall forming a guide for the valve and limiting its outward movement, and springs carried by the plate engaging the valve to normally hold it closed.

4. A cylinder, a cylinder-head having an annular passage therethrough, an annular valve therefor, a plate spaced from the cylinder-head, said plate forming a guide for the valve and limiting its outward movement, springs arranged to normally hold the valve closed, and bolts arranged to secure the spring, the plate, and the head to the cylinder.

In testimony that I claim the foregoing as my invention 1 have signed my name, in presence of two witnesses, this 19th day of April, 1904.

WILLIAM PRELLWITZ.

IVitnesses:

WARD RAYMOND, RUssELL II. WVILHELM. 

